TWM574357U - Reluctance motor structure - Google Patents

Abstract

A reluctance motor structure is provided, including a stator assembly and a rotor assembly disposed in the stator assembly. The rotor assembly has a main body and a first magnet embedded in the main body. The main body has an outer surface facing the stator assembly, wherein an air gap is formed between the outer surface and the stator assembly, and the shortest distance between the first magnet and the outer surface is 4~6 times of width of the air gap.

Description

Reluctance motor structure

The present invention relates to a motor structure, and more particularly to a reluctance motor structure.

Synchronous reluctance motor (SRM) or reluctance motor (RM) not only has the advantages of simple structure, easy maintenance, low cost, high efficiency, etc., but also meets the development direction of national energy conservation and environmental protection. It is widely used in various fields. In general, the main factor affecting the output characteristics of a synchronous reluctance motor is the design of the rotor, in which the saliency ratio of the rotor, that is, the direct axis and the quadrature axis inductance. The ratio Ld/Lq often determines the performance of the synchronous reluctance motor, such as the amount of output torque it can provide.

However, when the size of the mechanism in the synchronous reluctance motor is poorly designed, it will easily cause the output torque to be uneven and generate a large torque ripple (Torque Ripple), so that the motor generates vibration and noise when it is running. In view of this, how to improve the structural design of the conventional synchronous reluctance motor to increase its output torque and suppress the generation of torque ripple has become an important issue.

In view of the foregoing problems, an embodiment of the present invention provides a reluctance motor structure including a certain sub-assembly and a rotor assembly. The rotor assembly is disposed in the stator assembly and rotatable relative to the stator assembly. The rotor assembly has a body and a first magnet embedded in the body, and the body is formed with an outer circumferential surface facing the stator assembly, wherein an air gap is formed between the outer circumferential surface and the stator assembly, and the foregoing The shortest distance between the first magnet and the outer peripheral surface is 4 to 6 times the width of the air gap.

In one embodiment, the shortest distance is five times the width of the air gap.

In one embodiment, the stator assembly is formed with a plurality of teeth and a plurality of grooves, and the teeth and the groove are spaced apart from each other and surround the rotor assembly.

In one embodiment, the rotor assembly further has a second magnet embedded in the body, and the first magnet is closer to the stator assembly than the second magnet.

In one embodiment, the first magnet has a first thickness in a radial direction of one of the rotor assemblies, and the second magnet has a second thickness in the radial direction of the rotor assembly, wherein the first The thickness is greater than or equal to the aforementioned first thickness.

An embodiment of the present invention further provides a reluctance motor structure including a certain subassembly and a rotor assembly, wherein the rotor assembly is disposed in the stator assembly and rotatable relative to the stator assembly, wherein the rotor assembly has a body And a first magnet and a second magnet embedded in the body, wherein the first magnet is closer to the stator assembly than the second magnet, wherein the first magnet has a radial direction in one of the rotor assemblies a first thickness, a gap is formed between the first magnet and the second magnet in the radial direction of the rotor assembly, and the pitch is 0.75 to 1.5 times the first thickness. The main body is formed with an outer circumferential surface facing the stator assembly, an air gap is formed between the outer circumferential surface and the stator assembly, and a shortest distance between the first magnet and the outer circumferential surface is a width of the air gap. 4 to 6 times.

In an embodiment, the aforementioned spacing is equal to the aforementioned first thickness.

In one embodiment, the shortest distance is five times the width of the air gap.

In one embodiment, the stator assembly is formed with a plurality of teeth and a plurality of grooves, and the teeth and the groove are spaced apart from each other and surround the rotor assembly.

In one embodiment, the second magnet has a second thickness in the radial direction of the rotor assembly, wherein the second thickness is greater than or equal to the first thickness.

In one embodiment, the first magnet and the second magnet are respectively disposed in one of the first recess and the second recess of the body.

In one embodiment, the first magnet and the second magnet are arranged in parallel with each other.

The reluctance motor structure of the present embodiment will be described below. However, it will be readily appreciated that the present creative embodiment provides many suitable creative concepts and can be implemented in a wide variety of specific contexts. The specific embodiments disclosed are merely illustrative of the use of the present invention in a particular way, and are not intended to limit the scope of the present invention.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning meaning It will be understood that these terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning consistent with the relevant art and the context or context of the present disclosure, and should not be in an idealized or overly formal manner. Interpretation, unless specifically defined herein.

The above and other technical contents, features and effects of the present invention will be apparent from the following detailed description of the preferred embodiments. The directional terms mentioned in the following embodiments, for example, up, down, left, right, front or back, etc., are only directions referring to the additional drawings. Therefore, the directional terms used in the embodiments are intended to illustrate that they are not intended to limit the present invention.

First, please refer to FIGS. 1 and 2 together. FIG. 1 is a schematic view showing the structure of a reluctance motor according to an embodiment of the present invention, and FIG. 2 is a partially enlarged schematic view showing the upper right side portion of the reluctance motor structure in FIG. 1.

As shown in the first and second figures, the reluctance motor structure of the embodiment is a synchronous reluctance motor (SRM), which mainly includes a certain sub-assembly S and is disposed inside the stator assembly S and is opposite to the stator. The assembly S rotates one of the rotor assemblies R; the stator assembly S and the rotor assembly R respectively form a symmetrical structure, wherein the rotor assembly R includes a body R0, at least one first magnet M1 and at least one second magnet M2, the first magnet M1 and the second magnet M2 are respectively embedded in the first groove H1 and the second groove H2 in the body R0.

On the other hand, as can be seen from the first and second figures, the inner side of the stator assembly S is formed with a plurality of teeth S1 and a plurality of groove portions S2 arranged at intervals, and the tooth portion S1 and the groove portion S2 surround the rotor. Component R. Specifically, the reluctance motor structure of the present embodiment mainly comprises four first pairs of first magnets M1 and second magnets M2 respectively disposed in corresponding first grooves in four different quadrants of the body R0 of the rotor assembly R. The H1 and the second groove H2, and the first magnet M1 and the second magnet M2 in each pair have a rectangular structure and are parallel to each other.

It should be understood that when the ratio Ld/Lq of the direct axis d of the rotor component R to the quadrature axis inductance is larger, that is, the larger the salinity ratio is. , the reluctance motor can provide a large output torque.

As shown in Fig. 2, the stator assembly S is formed with an inner peripheral surface S', and the body R0 of the rotor assembly R is formed with an outer peripheral surface R0', wherein the outer peripheral surface R0' faces the inner peripheral surface S of the stator assembly S. ', and an air gap g is formed between the outer peripheral surface R0' of the body R0 of the rotor assembly R and the inner peripheral surface S' of the stator assembly S.

In the present embodiment, the outer peripheral surface R0' has a diameter of 72 mm, and the first magnet M1 has a first thickness T1 in one radial direction (the orthogonal direction q direction) of the rotor assembly R, and the second magnet M2 is in the aforementioned radial direction. The direction (the direction of the axis q) has a second thickness T2, wherein the second thickness T2 can be greater than or equal to the first thickness T1, and the first and second thicknesses T1 and T2 in the embodiment are both 4 mm. And the lengths of the first and second magnets M1, M2 in the direction perpendicular to the intersection axis q are both 25 mm.

Referring to FIG. 2, it should be particularly noted that a gap D1 is formed between the first and second magnets M1 and M2 in the radial direction (the direction of the intersecting axis q), and the first magnet M1 and the rotor are The outer peripheral surface R0' of the body R0 of the component R is separated by a shortest distance D2.

Next, referring to FIG. 3, FIG. 3 shows that the shortest distance D2 between the first magnet M1 and the outer peripheral surface R0' in FIG. 2 is the width of the air gap g between the outer peripheral surface R0' and the stator assembly S, respectively. 3, 5, 7, and 9 times, the torque chopping comparison of the distance between the first magnet M1 and the second magnet M2 and the first thickness T1 at different ratios, please refer to Table 1 below for related data.  <TABLE border="1" borderColor="#000000" width="85%"><TBODY><tr><td> D2/g </td><td> D1/T1 </td><td> Moment Chopping (%) </td><td> Average Output Torque (Nm) </td></tr><tr><td> 3.0 </td><td> 0.25 </td><td> 9% </td><td> 3.57 </td></tr><tr><td> 0.50 </td><td> 13% </td><td> 3.89 </td></tr> <tr><td> 0.75 </td><td> 17% </td><td> 4.10 </td></tr><tr><td> 1.00 </td><td> 18% </ Td><td> 4.14 </td></tr><tr><td> 1.25 </td><td> 18% </td><td> 4.14 </td></tr><tr>< Td> 1.50 </td><td> 18% </td><td> 4.14 </td></tr><tr><td> 1.75 </td><td> 19% </td><td > 4.12 </td></tr><tr><td> 2.00 </td><td> 22% </td><td> 4.02 </td></tr><tr><td> 5.0 < /td><td> 0.25 </td><td> 11% </td><td> 3.69 </td></tr><tr><td> 0.50 </td><td> 11% </ Td><td> 3.95 </td></tr><tr><td> 0.75 </td><td> 13% </td><td> 4.09 </td></tr><tr>< Td> 1.00 </td><td> 13% </td><td> 4.11 </td></tr><tr><td> 1.25 </td><td> 13% </td><td > 4.10 </td></tr><tr><td> 1.50 </td><td> 14% </td><td> 4.08 </td></tr><tr><td> 1.75 < /td><td> 22% </td><td> 3.98 </td></tr><tr><td> 7.0 </td>< Td> 0.25 </td><td> 15% </td><td> 3.77 </td></tr><tr><td> 0.50 </td><td> 16% </td><td > 3.98 </td></tr><tr><td> 0.75 </td><td> 17% </td><td> 4.07 </td></tr><tr><td> 1.00 < /td><td> 17% </td><td> 4.08 </td></tr><tr><td> 1.25 </td><td> 17% </td><td> 4.07 </ Td></tr><tr><td> 1.50 </td><td> 24% </td><td> 3.97 </td></tr><tr><td> 9.0 </td>< Td> 0.25 </td><td> 16% </td><td> 3.78 </td></tr><tr><td> 0.50 </td><td> 17% </td><td > 3.96 </td></tr><tr><td> 0.75 </td><td> 17% </td><td> 4.04 </td></tr><tr><td> 1.00 < /td><td> 18% </td><td> 4.04 </td></tr><tr><td> 1.25 </td><td> 23% </td><td> 3.94 </ Td></tr></TBODY></TABLE> Table 1  

As shown in the above Table 1 and FIG. 3, in order to analyze the ratio (D2/g) of the shortest distance D2 between the first magnet M1 and the outer peripheral surface R0' and the air gap g width, and the aforementioned pitch D1 and the first thickness T1 The ratio of the ratio (D1/T1) to the output performance of the reluctance motor, after repeated analysis and simulation, found that when the shortest distance D2 is 4-6 times the width of the air gap g (4≦D2/g≦6) ), the reluctance motor can be better in performance, and the reluctance motor can have both higher output torque and lower torque ripple. However, it should be particularly noted that in the simulation analysis of Tables 1 and 3 described above, the first thickness T1 and the air gap g width value of the first magnet M1 remain unchanged, and only the first magnet M1 and the outer peripheral surface are used. The shortest distance D2 between R0' and the distance D1 between the first and second magnets M1, M2 are taken as independent variables to observe their influence on the output performance of the reluctance motor.

As can be seen from the foregoing Table 1 and FIG. 3, when the ratio of the aforementioned shortest distance D2 to the aforementioned air gap g width is less than 4 (for example, when D2/g=3), the reluctance motor generates a large torque. Chopping, and when the ratio of the aforementioned shortest distance D2 to the aforementioned air gap g width is greater than 6 (for example, when D2/g=7 or D2/g=9), the reluctance motor also generates a large torque ripple. . According to the results of the above simulation analysis, it can be inferred that the shortest distance D2 between the first magnet M1 and the outer peripheral surface R0' of the body R0 of the rotor assembly R is 4 to 6 times the width of the air gap g (for example, D2/g). At 5 o'clock, the reluctance motor can have a lower torque ripple to avoid significant vibration and noise when the motor is running.

Next, please refer to FIG. 4, wherein FIG. 4 shows the ratio of the difference D1/the first thickness T1 when the distance D1/the first thickness T1=0.25 is used as a comparison reference (100%) in FIG. 2 ( D1/T1) Schematic diagram of the average torque increase ratio of the reluctance motor, where D2/g=5 remains unchanged. For related data, please refer to Table 2 below.  <TABLE border="1" borderColor="#000000" width="85%"><TBODY><tr><td> D2/g </td><td> D1/T1 </td><td> Average Output Torque (Nm) </td><td> Average Output Torque Increase Ratio (%) </td></tr><tr><td> 5.0 </td><td> 0.25 </td>< Td> 3.69 </td><td> 100% </td></tr><tr><td> 0.50 </td><td> 3.95 </td><td> 107% </td></ Tr><tr><td> 0.75 </td><td> 4.09 </td><td> 111% </td></tr><tr><td> 1.00 </td><td> 4.11 < /td><td> 111% </td></tr><tr><td> 1.25 </td><td> 4.10 </td><td> 111% </td></tr><tr ><td> 1.50 </td><td> 4.08 </td><td> 111% </td></tr><tr><td> 1.75 </td><td> 3.98 </td>< Td> 108% </td></tr></TBODY></TABLE> Table 2  

As can be seen from the area A and the fourth drawing of FIG. 3, the shortest distance D2 between the first magnet M1 and the outer peripheral surface R0' is 5 times the width of the air gap g (D2/g=5), and When the pitch D1 between the first and second magnets M1 and M2 is between 0.75 and 1.5 times the first thickness T1 (0.75 ≦ D1/T1 ≦ 1.5), not only the output torque of the reluctance motor can be greatly increased ( It can increase the torque ripple more than D1/T1=0.25, and also suppress the generation of torque ripple (torque chopping is less than 15%, as shown in area A in Figure 3). It can effectively improve the performance and stability of the reluctance motor.

In summary, the present invention mainly discloses a reluctance motor structure in which the shortest distance between the outer circumference of the first magnet and the rotor assembly is 4 to 6 times (for example, about 5 times) the width of the air gap. The torque chopping can be effectively reduced; in addition, when the distance between the first and second magnets in the radial direction of the rotor assembly is between 0.75 and 1.5 times the thickness of the first magnet in the radial direction (for example, 1 times), the output torque of the reluctance motor can be greatly improved and the torque ripple is low, so that the performance and stability of the reluctance motor can be effectively improved.

Although the embodiments of the present invention and its advantages have been disclosed as above, it should be understood that those skilled in the art can make changes, substitutions and refinements without departing from the spirit and scope of the present invention. In addition, the scope of protection of the present invention is not limited to the processes, machines, manufacturing, material compositions, devices, methods, and steps in the specific embodiments described in the specification, and any one of ordinary skill in the art may disclose the present disclosure. It is understood that the processes, machines, manufactures, compositions, devices, methods, and steps that are presently or in the future can be used in accordance with the present invention as long as they can perform substantially the same function or achieve substantially the same results in the embodiments described herein. Therefore, the scope of protection of the present invention includes the above processes, machines, manufacturing, material compositions, devices, methods and steps. In addition, each patent application scope constitutes an individual embodiment, and the scope of protection of the present invention also includes the combination of each patent application scope and embodiment.

Although the present invention has been disclosed in the preferred embodiments, it is not intended to limit the present invention. Anyone skilled in the art can make some changes and refinements without departing from the spirit and scope of the present invention. The scope of protection of this creation is subject to the definition of the scope of the patent application attached.

A‧‧‧ area

D‧‧‧straight axis

D1‧‧‧ spacing

D2‧‧‧ shortest distance

g‧‧‧Air gap

H1‧‧‧first groove

H2‧‧‧second groove

M1‧‧‧first magnet

M2‧‧‧second magnet

Q‧‧‧cross axis

R‧‧‧Rotor assembly

R0‧‧‧ Ontology

R0’‧‧‧ outer perimeter

S‧‧‧STAR assembly

S’‧‧‧ inner circumference

S1‧‧‧ teeth

S2‧‧‧ slot department

T1‧‧‧first thickness

T2‧‧‧second thickness

Fig. 1 is a view showing the structure of a reluctance motor according to an embodiment of the present invention. Fig. 2 is a partially enlarged schematic view showing the upper right side portion of the reluctance motor structure shown in Fig. 1. Fig. 3 shows that the shortest distance D2 between the first magnet M1 and the outer peripheral surface R0' in Fig. 2 is 3, 5, 7, and 9 of the width of the air gap g between the outer peripheral surface R0' and the stator assembly S, respectively. In the case of multiple times, a torque chopping comparison of the distance D1 between the first magnet M1 and the second magnet M2 and the first thickness T1 at different ratios is shown. Fig. 4 is a view showing an increase in the average torque of the reluctance motor for the ratio of the difference D1 to the first thickness T1 when the distance D1/the first thickness T1 = 0.25 in the second drawing is used as a comparison reference (100%). Schematic diagram of the ratio.

Claims (10)

A reluctance motor structure comprising: a certain sub-assembly; and a rotor assembly disposed in the stator assembly and rotatable relative to the stator assembly, wherein the rotor assembly has a body and is embedded in the body a magnet, and the body is formed with an outer circumferential surface facing the stator assembly; wherein an air gap is formed between the outer circumferential surface and the stator assembly, and a shortest distance between the first magnet and the outer circumferential surface, wherein the magnet The shortest distance is 4 to 6 times the width of the air gap. The reluctance motor structure of claim 1, wherein the shortest distance is five times the width of the air gap. The reluctance motor structure of claim 1, wherein the stator assembly is formed with a plurality of teeth and a plurality of grooves, and the teeth and the grooves are spaced apart and surround the rotor assembly. The reluctance motor structure of claim 1, wherein the rotor assembly further has a second magnet embedded in the body, and the first magnet is closer to the stator assembly than the second magnet. The reluctance motor structure of claim 4, wherein the first magnet has a first thickness in a radial direction of one of the rotor assemblies, and the second magnet is in the radial direction of the rotor assembly There is a second thickness, wherein the second thickness is greater than or equal to the first thickness. A reluctance motor structure comprising: a certain sub-assembly; and a rotor assembly disposed in the stator assembly and rotatable relative to the stator assembly, wherein the rotor assembly has a body and is embedded in the body a magnet and a second magnet, and the first magnet is closer to the stator assembly than the second magnet, wherein the first magnet has a first thickness in a radial direction of one of the rotor assemblies, the first magnet Forming a spacing between the second magnets in the radial direction of the rotor assembly, and the spacing is 0.75 to 1.5 times the first thickness; wherein the body is formed with an outer circumferential surface facing the stator assembly, An air gap is formed between the outer peripheral surface and the stator assembly, and a shortest distance between the first magnet and the outer peripheral surface, and the shortest distance is 4-6 times the width of the air gap. The reluctance motor structure of claim 6, wherein the spacing is equal to the first thickness. The reluctance motor structure of claim 6, wherein the shortest distance is five times the width of the air gap. The reluctance motor structure of claim 6, wherein the stator assembly is formed with a plurality of teeth and a plurality of grooves, and the teeth and the grooves are spaced apart and surround the rotor assembly. The reluctance motor structure of claim 6, wherein the second magnet has a second thickness in the radial direction of the rotor assembly, wherein the second thickness is greater than or equal to the first thickness.